Its very simple; apply the bollinger band to all time frames but its needed in 30min timeframe. In the 4hr apply the RSI. When RSI is above 50, its uptrend and below 50 is down trend. Then move to 30min for entries.

While in the 30min time frame, in an uptrend, wait for price to close below the lower band of the Bollinger, then a close above the lower band will make your entry for LONG